Juan Manuel Castillo (born 1932) is a Prasian musician known for his Nueva canción and protest music in the 1960s.
Castillo was born in San Ramon in 1932 and in the 1950s, he was a pianist in a mambo band in San Luis. In the late 1950s, he moved on to singing folk music and mostly political lyrics on the Latin American New Left, hippie and human rights movements. Right-wing Alfredo Salva's taking of power in 1966 led Castillo to work with a variety of other musicians to increase their production of protest music as well as attempting to go against the state.
Eventually, the authorities clamped down on him and his music. In late 1966, he was briefly arrested. Upon his release, he was even more vocal against the government, being re-arrested in 1967 and imprisoned for two years. By then, the protest music of him and his contemporaries was banned from the airwaves and record stores and many of his colleagues had left the country. Castillo was unable to leave the country and wanted to stay in Prasia. His career in music was over and he lived as a mechanic even after the fall of the Salva regime in the mid-1970s. Castillo lived rather anonymously and forgotten until 2014, when a Brunanter folk singer, Tanzi Brianna Tanzi, who knew his works was able to find him in Prasia. She and a friend in film created a documentary detailing his music, his life and hardships under the regime.